Abstract
Total cross section for the double neutral pion photoproduction off the proton is presented in the incident photon energy range of 0.58 to 1.15 GeV. The data were accumulated in the years 2009–2010, recorded by a 4π EM calorimeter at ELPH, named FOREST. The number of recorded events obtained during this period is 1.6×109 for a hydrogen target. Two neutral pions are reconstructed via detecting their decay products, four gammas (2π 0 → 4γ ). Compared to the previous results obtained by other groups, our data are in good agreement with theirs within error bars.
Highlights
Meson photoproduction off the nucleon is one of the tools to study the structure of hadrons in the non-perturbative domain of QCD
Total cross section for the double neutral pion photoproduction off the proton is presented in the incident photon energy range of 0.58 to 1.15 GeV
Compared to the previous results obtained by other groups, our data are in good agreement with theirs within error bars
Summary
While single pion photoproduction has been applied to studying nucleon resonances especially for the Δ-excitation, double pion channels may offer complementary information, on the resonances that couple weakly to a single pion, which is useful to disentangle the overlapping resonances at higher excitation energies. The 2π0 channel is a unique one, which provides interesting details because Born terms are strongly suppressed and the ρ0 meson can not directly couple to 2π0. ELPH provides a Bremsstrahlung photon beam which is generated by inserting a carbon fiber into circulating electrons in the 1.2 GeV synchrotron ring. Scattered electrons are detected with the tagging system “STB-Tagger II” to determine the photon energy. The details of the photon tagging counter STB-Tagger II are given in [3].
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